/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Selections/GeometrySelection.h
Replace the current set of selected items with those in the NewSelection, and return change information in DeltaOut
bool Replace ( const [FGeometrySelection](API\Plugins\DynamicMesh\Selections\FGeometrySelection) & NewSelection, [FGeometrySelectionDelta](API\Plugins\DynamicMesh\Selections\FGeometrySelectionDelta) & DeltaOut )